``The American Bankers Association is not happy with how regulators addressed concerns over how the Volcker Rule would affect community banks. Now, the industry trade group is threatening to take the matter to court... In a letter Monday, the association said it would file a lawsuit challenging the rule, unless regulators immediately suspended a provision that could force regional and community banks to divest themselves of an investment in collateralized debt obligations backed by trust preferred securities, known as TruPs.''